If I have this straight, you had sex with a person who smokes marijuana and you want to know if that can cause you to fail a urine drug screen? No. A urine drug screen will only show if you, yourself, smoked pot. Having sex with someone who uses will not make you positive for use. As long as you did not smoke any you will be clean! No worries! At least as far as a drug screen goes.
My question is do you practice birth control , & know about STD's?
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